MAX1519 Просмотр технического описания (PDF) - Maxim Integrated

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MAX1519

Dual-Phase, Quick-PWM Controllers for Programmable CPU Core Power Supplies

Maxim Integrated 

19-2734; Rev 1; 9/03

EVAALVUAAILTAIOBNLEKIT

Dual-Phase, Quick-PWM Controllers for

Programmable CPU Core Power Supplies

General Description

The MAX1519/MAX1545 are dual-phase, Quick-PWM™,

step-down controllers for desktop and mobile Pentium® 4

(P4) CPU core supplies. Dual-phase operation reduces

input ripple current requirements and output voltage rip-

ple while easing component selection and layout difficul-

ties. The Quick-PWM control scheme provides

instantaneous response to fast load-current steps. The

MAX1519/MAX1545 include active voltage positioning

with adjustable gain and offset, reducing power dissipa-

tion and bulk output capacitance requirements.

The MAX1519/MAX1545 are intended for two different

notebook CPU core applications: stepping down the bat-

tery directly or stepping down the 5V system supply to

create the core voltage. The single-stage conversion

method allows these devices to directly step down high-

voltage batteries for the highest possible efficiency.

Alternatively, two-stage conversion (stepping down the

5V system supply instead of the battery) at a higher

switching frequency provides the minimum possible

physical size.

The MAX1519/MAX1545 comply with Intel’s P4 specifi-

cations. The switching regulator features soft-start,

power-up sequencing, and soft-shutdown. The

MAX1519/MAX1545 also feature independent four-level

logic inputs for setting the suspend voltage (S0–S1).

The MAX1519/MAX1545 include output undervoltage

protection (UVP), thermal protection, and voltage regula-

tor power-OK (VROK) output. When any of these protec-

tion features detect a fault, the controller shuts down.

Additionally, the MAX1519/MAX1545 include overvoltage

protection.

The MAX1519/MAX1545 are available in low-profile, 40-

pin, 6mm x 6mm thin QFN packages. For other CPU

platforms, refer to the pin-to-pin compatible MAX1544

and MAX1532/MAX1546/MAX1547 data sheets.

Applications

Desktop and Mobile P4 Computers

Multiphase CPU Core Supply

Voltage-Positioned Step-Down Converters

Servers/Desktop Computers

Low-Voltage, Digitally Programmable Power

Supplies

Features

♦ Dual-Phase, Quick-PWM Controllers

♦ ±0.75% VOUT Accuracy Over Line, Load, and

Temperature (1.3V)

♦ Active Voltage Positioning with Adjustable Gain

and Offset

♦ 5-Bit On-Board DAC

Mobile: 0.60V to 1.75V Output Range

Desktop: 1.10V to 1.85V Output Range

♦ Selectable 100kHz/200kHz/300kHz/550kHz

Switching Frequency

♦ 4V to 28V Battery Input Voltage Range

♦ Adjustable Slew-Rate Control

♦ Drive Large Synchronous Rectifier MOSFETs

♦ Output Overvoltage Protection (MAX1545 Only)

♦ Undervoltage and Thermal-Fault Protection

♦ Power Sequencing and Timing

♦ Selectable Suspend Voltage (0.675V to 1.45V)

♦ Soft-Shutdown

♦ Selectable Single- or Dual-Phase Pulse Skipping

Ordering Information

PART

TEMP RANGE

MAX1519ETL -40°C to +100°C

MAX1545ETL -40°C to +100°C

PIN-PACKAGE

40 Thin QFN 6mm ✕ 6mm

40 Thin QFN 6mm ✕ 6mm

TOP VIEW

Pin Configuration

TIME 1

TON 2

SUS 3

S0 4

S1 5

SHDN 6

OFS 7

REF 8

ILIM 9

VCC 10

MAX1519

MAX1545

30 VDD

29 DLM

28 DHM

27 LXM

26 BSTM

25 VROK

24 D0

23 D1

22 D2

21 D3

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

Pentium is a registered trademark of Intel Corp.

THIN QFN

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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